WO2010131419A1 - Communication apparatus and communication control method - Google Patents
Communication apparatus and communication control method Download PDFInfo
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- WO2010131419A1 WO2010131419A1 PCT/JP2010/002776 JP2010002776W WO2010131419A1 WO 2010131419 A1 WO2010131419 A1 WO 2010131419A1 JP 2010002776 W JP2010002776 W JP 2010002776W WO 2010131419 A1 WO2010131419 A1 WO 2010131419A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
- H04L47/245—Traffic characterised by specific attributes, e.g. priority or QoS using preemption
Definitions
- the present invention relates to a communication device and a communication control method.
- Patent Document 1 describes a communication device using SCTP (Stream Control Transmission Protocol) defined by RFC (Request For Comment) 4960.
- SCTP Stream Control Transmission Protocol
- RFC Request For Comment
- an association corresponding to a connection using TCP is formed at the start of communication.
- TCP Transmission Control Protocol
- Each of the streams within an association is independent of each other, and each stream is all scheduled under uniform conditions.
- a congestion window cwnd Congestion window
- a reception window rwnd Receiveiver window
- the congestion window cwnd is provided for each destination IP (Internet Protocol) address
- the reception window rwnd is provided for each transmission destination apparatus.
- the destination IP All the streams in the association formed with the destination device to which the address is assigned are uniformly restricted in transmission. That is, in the communication using SCTP, as indicated by reference numeral A5 in FIG. 5, congestion is determined by the congestion window cwnd in the destination IP address unit, so even if the stream has a high priority for the user. Like other streams, it is subject to congestion control. Further, as indicated by reference numeral B5 in FIG. 5, when the communication destination SCTP reception window rwnd is congested, even if the stream has a high priority for the user, the congestion control is performed in the same manner as other streams. It becomes a target.
- An object of the present invention is to provide a communication device and a communication control method that can solve the above-described problems.
- the communication device of the present invention the determination means for determining whether the degree of congestion of communication with the communication destination device exceeds a predetermined determination value, and in a situation where the degree of congestion does not exceed the determination value, When a plurality of streams are transmitted in parallel to the communication destination device, and the congestion level exceeds the determination value, the priority of each of the streams among the plurality of streams transmitted in parallel is set.
- Communication control means for at least interrupting transmission of a stream having a priority lower than that of other streams.
- the communication control method of the present invention determines whether or not the degree of congestion of communication with a communication destination device exceeds a predetermined determination value, and in a situation where the degree of congestion does not exceed the determination value, the communication destination device When the plurality of streams are transmitted in parallel, and the congestion level exceeds the determination value, the priority indicating the priority of each of the streams among the plurality of streams transmitted in parallel At least transmission of a stream having a priority lower than that of the other streams is interrupted.
- the present invention when a network is congested, it is possible to transmit a high priority stream and interrupt the transmission of a low priority stream, and to control the stream transmission for each stream. It becomes possible.
- FIG. 1 It is the block diagram which showed the structure of 1 A of communication apparatuses which concern on one Embodiment of this invention. It is the figure which showed an example of the priority information in the storage part 3 shown in FIG. It is a figure for demonstrating a threshold value and a reference value. It is a figure for demonstrating a threshold value and a reference value. It is a figure for demonstrating the operation
- FIG. 1 is a block diagram showing a configuration of a communication apparatus 1A according to an embodiment of the present invention.
- the communication device 1A includes a reception unit 2, a storage unit 3, and a control unit 4.
- the control unit 4 includes a determination unit 5 and a communication control unit 6.
- the determination unit 5 includes a threshold storage unit 5a, a threshold determination unit 5b, a reference value storage unit 5c, and a reference value determination unit 5d.
- the communication control unit 6 includes an SCTP user unit 6a and a communication unit 6b.
- the communication device 1A can transmit a plurality of streams to the communication devices 1B and 1C.
- the communication device 1A uses SCTP as a transport layer protocol.
- the communication device 1A may be, for example, a mobile communication device (mobile station) such as a mobile phone or a radio base station device.
- the communication devices 1B and 1C are examples of communication destination devices and have the same function as the communication device 1A, for example.
- the accepting unit 2 can be generally called accepting means.
- the accepting unit 2 is, for example, an input key, and accepts priority information indicating the priority of each stream. Note that the priority information may represent the priority of each stream in units of messages in the stream.
- the storage unit 3 can generally be referred to as storage means.
- the storage unit 3 stores the priority information received by the receiving unit 2.
- FIG. 2 is a diagram showing an example of priority information in the storage unit 3.
- the priority information includes QoS (Quality of Service) Class 3a and Stream ID 3b.
- QoS Class 3a represents priority.
- the priority decreases in the order of EF, AF4, AF3, AF2, AF1, and BE.
- StreamID 3b is stream identification information. In this embodiment, a number is used as StreamID.
- QoS Class AF3 is not assigned to any stream.
- the storage unit 3 may store the priority information shown in FIG. 2 uniquely, or store the priority information in units of opposing SCTP devices (communication destination devices).
- control unit 4 can be generally referred to as control means.
- the control unit 4 In a situation where the degree of congestion of communication with the communication destination device (hereinafter simply referred to as “congestion degree”) does not exceed a predetermined determination value (hereinafter simply referred to as “determination value”), the control unit 4 A plurality of streams are transmitted in parallel to the communication destination device. Thereafter, when the degree of congestion exceeds the determination value, the control unit 4 has a priority represented by the priority information in the storage unit 3 among the plurality of streams transmitted in parallel as compared to the other streams. At least interrupt the transmission of low streams.
- the degree of congestion increases as the value of the congestion window cwnd increases or the value of the reception window rwnd from the communication destination apparatus decreases.
- control unit 4 transmits a stream using SCTP.
- the determination value a value smaller than the degree of congestion is used as which the control unit 4 determines that the communication state with the communication destination device is congestion according to SCTP.
- Determining unit 5 can be generally referred to as determining means.
- the determination unit 5 determines whether or not the degree of congestion has exceeded a determination value.
- the threshold value storage unit 5a stores a threshold value (determination value) for comparison with the value of the congestion window cwnd.
- the value of the congestion window cwnd indicates a smaller value as the degree of congestion is lower in communication with the communication destination device.
- the threshold determination unit 5b determines whether or not the value of the congestion window cwnd generated by the control unit 4 according to SCTP exceeds the threshold in the threshold storage unit 5a.
- the threshold determination unit 5b determines that the congestion level does not exceed the determination value.
- the threshold determination unit 5b determines that the degree of congestion has exceeded the determination value. The threshold determination unit 5b provides the determination result to the communication unit 6b.
- the reference value storage unit 5c stores a reference value (determination value) for comparison with the value of the reception window rwnd.
- a reference value determination value
- the value of the reception window rwnd indicates a larger value as the degree of congestion is lower in communication with the communication destination device.
- the reference value determination unit 5d determines whether or not the value of the reception window rwnd received by the control unit 4 from the communication destination device according to SCTP exceeds the reference value in the reference value storage unit 5c.
- the reference value determination unit 5d determines that the congestion level does not exceed the determination value when the value of the reception window rwnd exceeds the reference value in the reference value storage unit 5c. On the other hand, when the value of the reception window rwnd becomes a value that does not exceed the reference value in the reference value storage unit 5c, the reference value determination unit 5d determines that the degree of congestion has exceeded the determination value. The reference value determination unit 5d provides the determination result to the communication unit 6b.
- the communication control unit 6 can be generally referred to as communication control means.
- the communication control unit 6 transmits a plurality of streams in parallel to the communication destination device.
- the communication control unit 6 indicates that the priority information in the storage unit 3 includes a plurality of streams having different priorities. In such a situation, at least the transmission of a stream having a lower priority than the other streams represented by the priority information in the storage unit 3 is interrupted.
- the communication control unit 6 continues to transmit the stream having the highest priority and is not a stream having the highest priority. Transmission of at least the stream having the lowest priority is interrupted.
- the communication control unit 6 determines that the determination unit 5 has exceeded the determination value. Even when the determination is made, a plurality of streams are transmitted in parallel to the communication destination device as in the case where the degree of congestion does not exceed the determination value.
- the SCTP user unit 6a provides a transmission request for transmitting a plurality of streams to the communication unit 6b.
- the communication unit 6b parallelizes a plurality of streams to the communication destination device. To send.
- the communication unit 6b receives both of the determination result of the threshold value determination unit 5b and the determination result of the reference value determination unit 5d under the situation where a transmission request is received from the SCTP user unit 6a. If it is indicated that the degree of congestion does not exceed the determination value, it is determined that the degree of congestion does not exceed the determination value, and a plurality of streams are transmitted to the communication destination device in parallel.
- the priority information in the storage unit 3 At least transmission of a stream having a lower priority than that of the other streams is interrupted.
- the communication unit 6b in a situation where a transmission request is received from the SCTP user unit 6a, is one of or both of the determination result of the threshold value determination unit 5b and the determination result of the reference value determination unit 5d. Indicates that the congestion level has exceeded the determination value, and at least transmission of a stream having a priority lower than that of the other streams is indicated by the priority information in the storage unit 3. Interrupt.
- 3A and 3B are diagrams for explaining the relationship between the threshold value in the threshold value storage unit 5a and the congestion window cwnd, and the relationship between the reference value in the reference value storage unit 5c and the reception window rwnd.
- a threshold value 5a1 and a reference value 5c1 are provided.
- the control unit 4 periodically reads the value of the congestion window cwnd and the value of the reception window rwnd of the opposite SCTP communication device (communication destination device) that can be obtained by communication using SCTP.
- the control unit 4 determines that the degree of congestion has exceeded the determination value.
- the control unit 4 determines that the degree of congestion does not exceed the determination value. .
- control unit 4 also performs general congestion determination performed in communication using SCTP. For example, the control unit 4 determines that congestion has occurred when the response (Ack) of the SCTP signal cannot be received or when the signal is lost.
- FIG. 4 is a diagram for explaining an operation for controlling a stream to be transmitted.
- the congestion window cwnd of SCTP # 2 (communication device 1B) is determined to be in a congestion state, and only a signal transmission request for an SCTP message having a high priority is accepted.
- all the SCTP signal transmission requests are accepted because the congestion window cwnd and the reception window rwnd of SCTP # 2 (communication device 1B) are both in the normal state.
- the control unit 4 controls the stream to be transmitted based on the determination result as to whether or not the degree of congestion exceeds the determination value and the priority information in the storage unit 3.
- the control unit 4 refers to the priority information in the storage unit 3 to distinguish between a stream with a high priority (SCTP message) and a stream with a low priority (SCTP message).
- the control unit 4 schedules a plurality of streams (SCTP messages) uniformly and transmits them in parallel for lines whose congestion level does not exceed the determination value, regardless of priority.
- the control unit 4 determines the priority in the storage unit 3 based on the priority information in the storage unit 3. Transmission of a stream having a priority lower than that of the other stream is interrupted, and transmission of the other stream is performed.
- the control unit 4 may, for example, each time a message to be transmitted is changed.
- the correspondence relationship between the Stream ID 3b and the QoS Class 3a in the storage unit 3 may be dynamically changed.
- the control unit 4 transmits a plurality of streams in parallel to the communication destination device in a situation where the degree of congestion does not exceed the determination value. Thereafter, when the degree of congestion exceeds the determination value, the control unit 4 has a priority represented by the priority information in the storage unit 3 among the plurality of streams transmitted in parallel as compared to the other streams. At least interrupt the transmission of low streams.
- stream transmission control can be performed in units of messages.
- control unit 4 transmits a stream using SCTP, and a value that is smaller than the degree of congestion used by the control unit 4 to determine that the communication state with the communication destination device is congestion according to SCTP is used as the determination value. Is done.
- control unit 4 using SCTP determines that congestion has occurred according to SCTP and limits the number of signals transmitted to the network, the control unit 4 indicates that the congestion is approaching (congestion state). It becomes possible to recognize.
- control unit 4 using SCTP actually detects congestion, it is possible to reduce the load on the network and schedule a stream or message to be transmitted with priority.
- the degree of congestion increases as the value of the congestion window increases, or increases as the value of the reception window from the communication destination apparatus decreases. Therefore, the degree of congestion can be based on the congestion window or based on the reception window.
- control unit 4 may be realized in an upper layer of SCTP, or may be realized by being incorporated in SCTP itself.
- the congestion window cwnd managed by SCTP in units of IP addresses and the reception window rwnd of the communication destination SCTP can be further subdivided (for example, in units of associations or streams), thereby enabling the management of the present embodiment.
- the congestion control function enables finer control.
- the communication device 1A may be realized using dedicated hardware.
- the communication device 1 ⁇ / b> A may be realized using a computer system that executes a program for realizing the functions of the receiving unit 2, the storage unit 3, and the control unit 4. This computer system reads and executes the above-mentioned program recorded on a computer-readable recording medium, and functions as the receiving unit 2, the storage unit 3, and the control unit 4.
- the computer-readable recording medium refers to a recording medium such as a flexible disk, a magneto-optical disk, a CD-ROM (Compact Disk Read Only Memory), or a storage device such as a hard disk device built in the computer system.
- a recording medium such as a flexible disk, a magneto-optical disk, a CD-ROM (Compact Disk Read Only Memory), or a storage device such as a hard disk device built in the computer system.
- the present invention can be used for, for example, a communication device capable of transmitting a plurality of streams. According to the present invention, when a network is congested, it is possible to transmit a high priority stream and interrupt transmission of a low priority stream. As a result, stream transmission can be controlled for each stream.
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Abstract
Description
2 受付部
3 格納部
4 制御部
5 判定部
5a 閾値記憶部
5b 閾値判定部
5c 基準値記憶部
5d 基準値判定部
6 通信制御部
6a SCTPユーザ部
6b 通信部 1A to
Claims (10)
- 通信先装置との通信の輻輳度が予め定められた判定値を超えているかどうかを判定する判定手段と、
前記輻輳度が前記判定値を超えていない状況では、前記通信先装置に複数のストリームを並列的に送信し、その後、前記輻輳度が前記判定値を超えると、前記並列的に送信されている前記複数のストリームのうち、前記ストリームのそれぞれの優先度を表す優先度情報にて表される優先度が他のストリームよりも低いストリームの送信を少なくとも中断する通信制御手段と、
を具備する通信装置。 Determination means for determining whether the degree of congestion of communication with the communication destination device exceeds a predetermined determination value;
In a situation where the congestion level does not exceed the determination value, a plurality of streams are transmitted in parallel to the communication destination device, and then, when the congestion level exceeds the determination value, the streams are transmitted in parallel. Communication control means for at least interrupting transmission of a stream having a priority lower than that of other streams represented by priority information indicating the priority of each of the plurality of streams;
A communication apparatus comprising: - 請求項1に記載の通信装置において、
前記優先度情報は、前記ストリームのそれぞれの優先度を、当該ストリーム内のメッセージ単位で表すものである、通信装置。 The communication device according to claim 1,
The priority information is a communication device that represents each priority of the stream in units of messages in the stream. - 請求項2に記載の通信装置において、
前記通信制御手段は、送信対象となるメッセージが変更されるごとに、前記優先度情報と前記メッセージとの間の対応関係を動的に変更する通信装置。 The communication device according to claim 2,
The communication control unit is a communication device that dynamically changes a correspondence relationship between the priority information and the message each time a message to be transmitted is changed. - 請求項1から3のいずれか1項に記載の通信装置において、
前記通信制御手段は、SCTPを利用して前記ストリームを送信し、
前記判定値は、前記通信制御手段が前記SCTPに従って前記通信先装置との通信状態を輻輳と判定する輻輳度よりも小さいものである、通信装置。 The communication apparatus according to any one of claims 1 to 3,
The communication control means transmits the stream using SCTP,
The determination value is a communication apparatus in which the communication control means is smaller than a congestion degree for determining that the communication state with the communication destination apparatus is congestion according to the SCTP. - 請求項1から4のいずれか1項に記載の通信装置において、
前記輻輳度は、輻輳ウィンドウの値が大きくなるほど大きくなるもの、または、前記通信先装置からの受信ウィンドウの値が小さくなるほど大きくなるものである、通信装置。 The communication device according to any one of claims 1 to 4,
The communication device, wherein the degree of congestion increases as the value of the congestion window increases, or increases as the value of the reception window from the communication destination device decreases. - 請求項5に記載の通信装置において、
前記通信制御手段は、前記輻輳ウィンドウの値が閾値を超え、かつ、前記受信ウィンドウの値が基準値を超えていない場合に、前記輻輳度が前記判定値を超えたと判定する通信装置。 The communication device according to claim 5, wherein
The communication apparatus, wherein the communication control unit determines that the degree of congestion has exceeded the determination value when the value of the congestion window exceeds a threshold value and the value of the reception window does not exceed a reference value. - 請求項1~6のいずれか1項に記載の通信装置において、
前記優先度情報を受け付ける受付手段と、
前記受付手段にて受け付けられた前記優先度情報を格納する格納手段と
を具備する通信装置。 The communication device according to any one of claims 1 to 6,
Receiving means for receiving the priority information;
And a storage unit that stores the priority information received by the receiving unit. - 請求項1~7のいずれか1項に記載の通信装置において、
前記通信制御手段は、前記輻輳度が前記判定値を超えた場合、前記並列的に送信されている前記複数のストリームのうち、最も高い優先度を持つストリームの送信を継続し、かつ、前記最も高い優先度を持つストリーム以外のストリームのうち、少なくとも最も低い優先度を持つストリームの送信を中断する通信装置。 The communication device according to any one of claims 1 to 7,
The communication control means, when the congestion level exceeds the determination value, continues transmission of the stream having the highest priority among the plurality of streams transmitted in parallel, and the highest A communication apparatus that interrupts transmission of a stream having at least the lowest priority among streams other than streams having a high priority. - 請求項1~8のいずれか1項に記載の通信装置において、
前記通信制御手段は、すべてのストリームが同一の優先度を持つ場合、前記輻輳度が前記判定値を超えていても、前記通信先装置に前記複数のストリームを並列的に送信する通信装置。 The communication device according to any one of claims 1 to 8,
The communication control unit is a communication device that, when all streams have the same priority, transmits the plurality of streams in parallel to the communication destination device even if the congestion level exceeds the determination value. - 通信先装置との通信の輻輳度が予め定められた判定値を超えているかどうか判定し、
前記輻輳度が前記判定値を超えていない状況では、前記通信先装置に複数のストリームを並列的に送信し、
その後、前記輻輳度が前記判定値を超えると、前記並列的に送信されている前記複数のストリームのうち、前記ストリームのそれぞれの優先度を表す優先度情報にて表される優先度が他のストリームよりも低いストリームの送信を少なくとも中断する通信制御方法。 Determine whether the congestion degree of communication with the communication destination device exceeds a predetermined determination value,
In a situation where the degree of congestion does not exceed the determination value, a plurality of streams are transmitted in parallel to the communication destination device,
After that, when the degree of congestion exceeds the determination value, among the plurality of streams transmitted in parallel, the priority represented by the priority information indicating the priority of each of the streams is other than A communication control method for at least interrupting transmission of a stream lower than the stream.
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CN2010800203415A CN102422604A (en) | 2009-05-11 | 2010-04-16 | Communication apparatus and communication control method |
JP2011513225A JP5338904B2 (en) | 2009-05-11 | 2010-04-16 | Communication apparatus and communication control method |
US13/319,242 US8923119B2 (en) | 2009-05-11 | 2010-04-16 | Communication apparatus and communication control method |
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CN102422604A (en) | 2012-04-18 |
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EP2432173A1 (en) | 2012-03-21 |
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